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Investment Securities (Schedule of Investment Securities) (Details) - USD ($)
$ in Thousands
Feb. 26, 2022
May 29, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current $ 81,601 $ 111,505
Unrealized Gains, Current 0 664
Unrealized Losses, Current 476 11
Estimated Fair Value, Current 81,125 112,158
Amortized Cost, Noncurrent 2,967 2,306
Unrealized Gains, Noncurrent 0 1,810
Unrealized Losses, Noncurrent 53 0
Estimated Fair Value, Noncurrent 2,914 4,116
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 514 16,424
Unrealized Gains, Current 0 56
Unrealized Losses, Current 3 0
Estimated Fair Value, Current 511 16,480
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 9,980 1,998
Unrealized Gains, Current 0 0
Unrealized Losses, Current 23 0
Estimated Fair Value, Current 9,957 1,998
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 61,634 80,092
Unrealized Gains, Current 0 608
Unrealized Losses, Current 344 0
Estimated Fair Value, Current 61,290 80,700
Certificates of Deposits [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 1,268 1,077
Unrealized Gains, Current 0 0
Unrealized Losses, Current 12 1
Estimated Fair Value, Current 1,256 1,076
Asset Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 8,205 11,914
Unrealized Gains, Current 0 0
Unrealized Losses, Current 94 10
Estimated Fair Value, Current 8,111 11,904
Mutual Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Noncurrent 2,967 2,306
Unrealized Gains, Noncurrent 0 1,810
Unrealized Losses, Noncurrent 53 0
Estimated Fair Value, Noncurrent $ 2,914 $ 4,116